Dear all, good morning! I have a Coral 28 Full speedboat (2007) with a Bravo 3 Mercruiser 5.0 260HP gasoline outboard engine. The boat has been sailing for 430 hours and I have owned it for about 4 years. I bought it after 350 hours of sailing and I only fuel it with Podium. The previous owner performed periodic maintenance, including replacing the mufflers. I also perform maintenance and my sailing is very smooth. It does not exceed 3,000 rpm and sometimes I go months without sailing.
A year ago, the engine was performing below normal. I called a marine mechanic who, after analyzing it, reported that the distributor had oil residue. He said that the distributor would have to be replaced, so I replaced the entire distributor and the boat started sailing normally again. Three months ago, I started having a series of engine problems that were discouraging. The engine was not performing well and seemed to be running in safety mode. I called the mechanic, who said it was the spark plug wires. I changed the wires and spark plugs. When testing in water, the mechanic identified a problem with the water pump. We replaced the water pump repair kit. When testing again, we found that the lever that connects the engine to the stern drive was corroded and broken. To make this change, it was necessary to remove the stern drive and move the engine. We replaced the entire lever assembly, pin and other items in this assembly. When testing in water, we identified after starting tests that the alternator was sending 17/18% power. We removed the alternator and sent it to a specialized workshop to rebuild the entire part. When installing the alternator and testing, we noticed that the engine, when reaching 1100 rpm, drops in revs as if it were in safety mode. The mechanic analyzed it and identified the need to replace the temperature sensor. We replaced this sensor. When testing the engine, the acceleration continued to drop when it reached 1100 rpm. At that moment, we called a Mercury technician to scan the engine and the scan only showed a fault in the TPS sensor. We replaced this sensor and the problem persisted, without showing any fault on the scanner. Then the Mercury technician started checking other engine items: Fuel pump OK, Oil pump OK, IAC OK, Cylinder pressure 11-11-10-10-9-8-8-7, Wiring OK, Injector nozzles removed and cleaned OK, he checked the CPS and said it was OK. I tested the module on another engine like mine and it was OK. After these tests, he said that the problem is more serious and that it will possibly be necessary to remove the engine from the boat to analyze it in the workshop. This work takes a huge amount of time and has a frightening cost.
I know you are a Mercruiser specialist technician, but I have a feeling that it might be something less complicated and that is why I am looking for anyone who has had this problem with this type of engine and can share this experience/solution with me. I am immensely grateful for all your collaboration. Thank you.
A year ago, the engine was performing below normal. I called a marine mechanic who, after analyzing it, reported that the distributor had oil residue. He said that the distributor would have to be replaced, so I replaced the entire distributor and the boat started sailing normally again. Three months ago, I started having a series of engine problems that were discouraging. The engine was not performing well and seemed to be running in safety mode. I called the mechanic, who said it was the spark plug wires. I changed the wires and spark plugs. When testing in water, the mechanic identified a problem with the water pump. We replaced the water pump repair kit. When testing again, we found that the lever that connects the engine to the stern drive was corroded and broken. To make this change, it was necessary to remove the stern drive and move the engine. We replaced the entire lever assembly, pin and other items in this assembly. When testing in water, we identified after starting tests that the alternator was sending 17/18% power. We removed the alternator and sent it to a specialized workshop to rebuild the entire part. When installing the alternator and testing, we noticed that the engine, when reaching 1100 rpm, drops in revs as if it were in safety mode. The mechanic analyzed it and identified the need to replace the temperature sensor. We replaced this sensor. When testing the engine, the acceleration continued to drop when it reached 1100 rpm. At that moment, we called a Mercury technician to scan the engine and the scan only showed a fault in the TPS sensor. We replaced this sensor and the problem persisted, without showing any fault on the scanner. Then the Mercury technician started checking other engine items: Fuel pump OK, Oil pump OK, IAC OK, Cylinder pressure 11-11-10-10-9-8-8-7, Wiring OK, Injector nozzles removed and cleaned OK, he checked the CPS and said it was OK. I tested the module on another engine like mine and it was OK. After these tests, he said that the problem is more serious and that it will possibly be necessary to remove the engine from the boat to analyze it in the workshop. This work takes a huge amount of time and has a frightening cost.
I know you are a Mercruiser specialist technician, but I have a feeling that it might be something less complicated and that is why I am looking for anyone who has had this problem with this type of engine and can share this experience/solution with me. I am immensely grateful for all your collaboration. Thank you.
